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I'm looking for a reference (a book/article) with a formula to $$ \frac{ \partial ^ k }{ \partial x_1^{k_1} ... \partial x_n^{k_n} } f_1(x) ... f_m(x) , $$ where $k=k_1+...+k_n$, $x=(x_1,...,x_n)\in\mathbb{R}^n$, $f_i\colon\mathbb{R}^n\to\mathbb{R}$.

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